From 3fd36c27e9455dae10ed4f569ca4362219bbcbcb Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 4 Sep 2018 16:10:21 +0200
Subject: Initial work on binless (binary-less aka header-only) library support

---
 build2/algorithm.hxx | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'build2/algorithm.hxx')

diff --git a/build2/algorithm.hxx b/build2/algorithm.hxx
index 430cc9f..e908df8 100644
--- a/build2/algorithm.hxx
+++ b/build2/algorithm.hxx
@@ -656,6 +656,9 @@ namespace build2
   //
   // You can also clean extra files derived from ad hoc group members.
   //
+  // Note that if the target path is empty then it is assumed "unreal" and
+  // is not cleaned (but its prerequisites/members still are).
+  //
   target_state
   clean_extra (action, const file&,
                initializer_list<initializer_list<const char*>> extra);
-- 
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